public class Example4_7{
  public static void main (String args[]){
	Battery nanfu = new Battery(100);
	System.out.println("南孚电池的储电量是："+nanfu.electricityAmount);
	Radio radio = new Radio();
	System.out.println("收音机开始使用南孚电池：");
	radio.openRadio(nanfu);
	System.out.println("目前南孚电池的储电量是："+nanfu.electricityAmount);
	}
}
